Parallel and Perpendicular Lines Graphically

Two lines that are perpendicular lines have ...

• Slope that is opposite reciprocals

• No Slope

• Slope that is the same

• none of the above

Which figure shows a set of parallel lines?

• Figure 1

• Figure 2

• Figure 3

• Figure 4

Which figure shows a set of perpendicular lines?

• Figure 1

• Figure 2

• Figure 3

• Figure 4

Choose the most precise answer: These roads are

• Intersecting

• Perpendicular

• Parallel

Choose the most precise answer: These streets are

• Parallel

• Perpendicular

• Intersecting

What slope is parallel to:  
m = 4

• 4

• -1/4

• -4

• 1/4

What slope is perpendicular to:  
m = 5/8

• -5/8

• 5/8

• -8/5

• 8/5

What slope is perpendicular to:  
m = 3

• -3

• -1/3

• 1/3

• 3

A line is perpendicular to    y = 2x - 7.
What is the slope of this line? 

• -2

• 1/2

• -1/2

• 2

Slopes of perpendicular lines are...

• opposite reciprocals

• opposites

• identical

• reciprocals